Many people feared the presence of Japanese spies after Japan had attacked Pearl Harbor.
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Railroads changed an developed the way Americans traveled across the United States.
Rail travel became safer and in less time. People from New England could travel to California in lesser time and in a little bit more comfortable and secure way.
Regarding commerce, transcontinental railroads created new opportunities for trade and opened new markets, reducing prices of transportation that took products to their final destiny in less time.
